“Big Brother” Sunday and Tuesday were top dog, with both episodes of the reality series earning a 2.2 rating in the advertiser-sought 18-49 demographic. The Wednesday installment received a 2.1, tying for third place last week week Tuesday’s “Talent” and Sunday’s Fox NFL preseason game.

ABC’s “20/20” tribute to Robin Williams had a 1.7, good for eighth place. In ninth, “Running Wild With Bear Grylls” moved up thanks to a Channing Tatum appearance and a 1.5 rating, which was shared by a “Big Bang Theory” rerun, as well as new “Under the Dome” and “Bachelor in Paradise” episodes.